1/* 2 * Copyright (c) 1980 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18#if defined(LIBC_SCCS) && !defined(lint) 19 .asciz "@(#)frexp.s 5.5 (Berkeley) 06/27/88" 20#endif /* LIBC_SCCS and not lint */ 21 22/* C library -- frexp(value, eptr) */ 23 24#include "DEFS.h" 25 26ENTRY(frexp, 0) 27 movd 4(ap),r0 # (r0,r1) := value 28 extzv $7,$8,r0,*12(ap) # Fetch exponent 29 jeql 1f # If exponent zero, we're done 30 subl2 $128,*12(ap) # Bias the exponent appropriately 31 insv $128,$7,$8,r0 # Force result exponent to biased 0 321: 33 ret 34